3. Application (URL) Platform Availability
CardZort (www.cardzort.com) Windows Commercial product
WebSort
(www.websort.net)
Web-based Commercial service
OpenSort
(www.themindcanvas.com)
Web-based Commercial service
OptimalSort
(www.optimalsort.com)
Web-based Commercial service
SynCaps
(www.syntagm.co.uk/design/syncapsv2.shtml)
Windows Commercial product
xSort
(www.ipragma.com/xsort)
MAC OS X Commercial product
WebCAT
(zing.ncsl.nist.gov/WebTools/WebCAT/)
Windows/ UNIX Free
USort/EZCalc (IBM)1 Windows Free but now archived; no longer supported
Source: http://usabilitynews.org/card-sorting-what-you-need-to-know-about-analyzing-and-interpreting-card-sorting-results/